Quick verdict
Two cordless saws with corded power in two layouts. The DeWalt is a sidewinder with a touch more cut capacity; the Milwaukee is a rear-handle saw with the long-rip control and blade-left sight line of a worm drive. For deck framing the rear handle is the nicer tool; for everything else the layout you grew up with decides.
Milwaukee 2830-20 M18 FUEL Rear Handle 7-1/4 Inch Circular Saw
The 2830-20 is the M18 FUEL rear-handle 7-1/4 inch saw: brushless, 5,800 RPM, electric brake, 2-1/2 inch depth of cut, a 53 degree bevel and a worm-drive-style layout with the blade on the left. It runs on M18 High Output packs with the power of a corded worm drive.
DeWalt DCS578B FlexVolt sidewinder circular saw versus Milwaukee 2830-20 M18 FUEL rear-handle circular saw: layout, power, depth, bevel and platform compared from published specifications.
The picks at a glance
| Tool | Best for | Score /100 | |
|---|---|---|---|
| Milwaukee 2830-20 M18 FUEL Rear Handle 7-1/4 Inch Circular Saw | Best Rear-Handle Cordless Saw | 9.2 | Check price |
| DeWalt DCS578B FlexVolt 60V MAX 7-1/4 Inch Circular Saw | Best Sidewinder for Framing | 9.1 | Check price |
The picks, reviewed
Milwaukee 2830-20 M18 FUEL Rear Handle 7-1/4 Inch Circular Saw
The 2830-20 is the M18 FUEL rear-handle 7-1/4 inch saw: brushless, 5,800 RPM, electric brake, 2-1/2 inch depth of cut, a 53 degree bevel and a worm-drive-style layout with the blade on the left. It runs on M18 High Output packs with the power of a corded worm drive.
Reasons to buy
- Rear-handle control on long rips
- Blade left for right-handers
- Corded worm-drive power
- M18 full yard range
Reasons to avoid
- Long and heavy
- Wants High Output packs
- More saw than fence pickets need
DeWalt DCS578B FlexVolt 60V MAX 7-1/4 Inch Circular Saw
The DCS578B is the FlexVolt 60V MAX 7-1/4 inch sidewinder: brushless, 5,800 RPM, electric brake, 2-9/16 inch depth of cut and a 57 degree bevel. It has the power of a corded saw in a conventional layout.
Reasons to buy
- Corded-class power
- Conventional sidewinder layout
- Deeper cut and wider bevel
- FlexVolt runs chainsaws and mowers
Reasons to avoid
- Blade right for some users
- Heavier than a 20V saw
- FlexVolt packs cost more
Where these two differ
Layout first. The DeWalt DCS578B is a sidewinder with the handle over the motor and the blade on the right; the Milwaukee 2830-20 is a rear-handle saw with the handle behind the motor and the blade on the left. Both are brushless 7-1/4 inch saws at 5,800 RPM with electric brakes and corded-class power. The DeWalt cuts a touch deeper and bevels further; the Milwaukee gives the control of a worm drive on long rips.
This comparison is based on the published specifications and manuals for both saws and on recurring owner feedback. We have not run either saw ourselves.
| Specification | DCS578B | 2830-20 |
|---|---|---|
| Layout | Sidewinder | Rear handle |
| Blade side | Right | Left |
| Platform | FlexVolt 60V | M18 FUEL |
| Speed | 5,800 RPM | 5,800 RPM |
| Depth at 90 | 2-9/16 inch | 2-1/2 inch |
| Bevel | 57 degrees | 53 degrees |
Layout and sight line
A right-handed user sees the blade and the line on the Milwaukee without leaning over the saw. On the DeWalt the blade is on the far side and the line is watched through the shoe notch. Rear-handle owners also describe better push on a long rip through a 2×12; sidewinder owners describe a lighter, quicker saw for crosscuts.
Power
Both rip wet pressure-treated lumber without slowing on their big packs. Neither leaves a deck builder wanting more.
Weight and handling
The Milwaukee is long and heavy, as rear-handle saws are, and is best on a sawhorse. The DeWalt is heavy for a sidewinder and still the easier saw to carry up a ladder for a fence post.
Batteries and runtime
FlexVolt packs run the DeWalt chainsaw, mower and blower. M18 High Output packs run the Milwaukee saw at full power and the rest of the M18 yard range. Both drain a mid-size pack in an afternoon of joists.
Blades and setup
Both take 7-1/4 inch blades with a 5/8 inch arbor. A 24-tooth framing blade suits both for joists. Depth and bevel adjust with levers on both; the Milwaukee bevel scale faces the user.
Yard jobs this decides
Deck framing with long rips favors the Milwaukee. Fence pickets, rails and quick crosscuts favor the DeWalt. A shed is a draw. The battery decides the rest; both platforms run a full yard.
Warranty and support
On the DeWalt DCS578B, DeWalt covers it with a three-year limited warranty, one year of free service and a 90-day money-back guarantee. On the Milwaukee 2830-20, Milwaukee covers M18 FUEL tools with a five-year warranty and M18 packs with three years. Both makers run service networks in the US and both honor the warranty only with proof of purchase, so keep the receipt with the manual. Registration takes a few minutes online and is worth doing the day the tool arrives.
Common owner complaints
DCS578B owners mention weight and blade-right visibility. 2830 owners mention length, weight and the need for High Output packs. Both are reliable.
Which one should you buy
Buy the DCS578B on FlexVolt or for a lighter saw with more bevel. Buy the 2830-20 on M18 or for rear-handle control on framing.
Our verdict
The Milwaukee 2830-20 edges this comparison for deck framing. The DeWalt DCS578B is the better general-purpose saw and wins on cut capacity.
How we research
This comparison is built from the published specifications, manuals and warranty terms of both products and from recurring owner feedback. We have not run either product ourselves; where the makers do not publish a figure we say so rather than guess.
What to look for
Layout
Sidewinder or rear handle is the first question.
Blade side
The Milwaukee blade-left suits right-handed users watching the line.
Platform
FlexVolt or M18 packs decide.
Cut capacity
The DeWalt cuts deeper and bevels further.
Our verdict
Two cordless saws with corded power in two layouts. The DeWalt is a sidewinder with a touch more cut capacity; the Milwaukee is a rear-handle saw with the long-rip control and blade-left sight line of a worm drive. For deck framing the rear handle is the nicer tool; for everything else the layout you grew up with decides.
FAQs
A layout with the handle behind the motor like a worm drive, giving more push on long rips and a blade-left sight line. The Milwaukee has the layout without the worm gear.
Both are corded class. The Milwaukee on a High Output pack and the DeWalt on FlexVolt rip wet 2x without slowing.
The DeWalt; rear-handle saws are long and heavy.
The DeWalt at 57 degrees against 53.
Related guides
Milwaukee 2830-20 vs Makita XSH06Z: M18 FUEL Rear Handle Against the X2 LXT Sidewinder
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Milwaukee 2732-20 vs Makita XSR01PT: M18 FUEL Sidewinder Against the X2 Rear-Handle Kit
DeWalt DCS570B vs Makita XSR01PT: 20V Sidewinder Against the X2 Rear-Handle Kit
DeWalt DCS570B vs Makita XSH06Z: 20V Single Pack Against X2 LXT Two-Pack Circular Saw
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DeWalt DCS578B vs Makita XSR01PT: FlexVolt Sidewinder Against the X2 Rear-Handle Kit
